To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the Photon-1200's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).
Ripple suppression isn't good, especially at operating temperatures that exceed 44 degrees C. On the +12V rail, we don't want to see results above 50mV. Clearly, this platform lets us down with ripple measurements close to 120mV. The Photon-1200 cannot operate properly at high ambient temperatures and this is why it didn't manage to keep ripple suppression under control, failing in the 110 percent and Cross-Load 2 tests. Keep this thing's operating temperature below 40 °C, just as Rosewill recommends.
Ripple Oscilloscope Screenshots
The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We usually set 0.01V/Div (each vertical division/box equals 0.01V) as the standard for all measurements; however, in this case we had to increase to 0.02V/Div for the +12V rail.